Oddly enough banks seem rather casual about counterfeit bills. I own some apartments and some of my renters pay in cash. So for years I have monthly gone to the bank, filled out a deposit slip, put that and 24 c-notes on the counter and they just count it. Never realy look at it. But if I take that same bill to the store they will use the magic pen, hold it up to the light,etc. Maybe it's because it's my account but they just throw the bills in a drawer. How would they trace them to me?